VERTICAL DISTRIBUTION OF DIATOMS ON MOSSES IN WELLS OF BIJELJINA MUNICIPALITY IN BOSNIA AND HERZEGOVINA

Abstract

Vertical distribution of species and infraspecies taxa of diatoms (Bacillariophyta) on well mosses where they live epiphytically, and a relative number of individuals per surface area unit were followed in 8 open wells with shadoof. Researches were conducted during 2015-2016 through four seasons. Sampling of algae material from well mosses that cover interior of the well was conducted on every 50 cm of depth starting from the surface (O cm) to 200 cm.

Considering the specificity of substrate on which diatoms live in wells, and those are mosses that are especially expressed to 1,5 m depth of well and whose leafs cover each other and have an effect on light climate of micro habitat with already existing differences in intensity and quality of light, relative humidity of air, temperature of air on different depths, density of populations of certain species Bacillariophyta is in function of such ecological occasions on different well depths. It is concluded that the most abundant populations on mosses of researched wells, during most of the year, develop four aerophilic species of diatoms: Navicula contenta Grunow, N. atomus var. atomus (Kiitzing) Grunow, Achnanthes lanceolata (Brebisson) Grunow ssp. lanceolata var. lanceolata and Amphora normanii Rabenhorst.